ass Share definition Flag 1)n. A type of donkey or mule 2)n. a slang term to discribe the buttox 3)n. A stupid or foolish person 1) I rode my ass up the mountain. 2) I'll sake my ass in your face. 3) Stop being an ass! ass by Anonymous June 14, 2003 0 0 Get merch Get the ass mug. Buy Now — $32.95 See more merch